Agere Systems Inc.

General Instrument Corporation

Robert Friedman

Clyde N Robbins

Hong Wan

Muhammad Fazili

In a communication system comprising a link layer device connectable to one or more physical layer devices, the link layer device is configured using an efficient shared architecture for processing data associated with a plurality of links including at least one ingress link and at least one egress link. The link layer device comprises an ingress data clock processor configured to generate an ingress clock signal for processing data associated with said at least one ingress link, an egress data clock processor configured to generate an egress clock signal for processing data associated with said at least one egress link, and a control and configuration unit shared by the ingress data clock processor and the egress data clock processor. Another aspect of the invention relates to a buffer adaptive processor that in an illustrative embodiment limits clock variability in the presence of cell delay variation or cell loss.

Link layer device with clock processing hardware resources shared among multiple ingress and egress links

A television converter uses digital signal processing (DSP) to provide compatibility with different television standards including NTSC and PAL video standards and FM, BTSC, DIN, Home Theatre, NICAM and independent digital audio standards. Audio processing is accomplished without passing the audio through a Nyquist filter used for video. This eliminates AM to PM conversion improving luminance linearity and differential gain and phase. It also prevents video information from phase modulating the audio intercarrier, thereby eliminating video 'buzz' components in the audio. The audio processing includes a synchronous FM demodulator and a separate synchronous FM/QPSK demodulator for handling the different audio standards. Handling historical analog TV standards with DSP also enables the advantageous combination of analog and digital television reception within a single digital VLSI ASIC.

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Jamison, PA, United States of America

Robert Friedman